Melt butter with the cocoa or chocolate together in a heavy saucepan over medium low, whisking constantly till blended.

Remove from heat and stir in the sugar. Whisk in the eggs and vanilla and cooled coffee . Stir in flour, salt and walnuts. Mix well.

Pour into a well buttered 8-inch square baking pan. Bake at 325 degrees for about 40 minutes till a toothpick inserted in the center comes out clean. Cool completely and cut into squares. These brownies are very fudgy and may be somewhat difficult to slice cleanly; use a sharp knife and a spatula to help them loosen from the baking dish. Sometimes I use a spoon and make it my personal indulgence for the day!